import * as React from 'react';
import * as LabelPrimitive from '@radix-ui/react-label';
import { Slot } from '@radix-ui/react-slot';
import { Controller, ControllerProps, FieldPath, FieldValues, FormProvider, useFormContext } from 'react-hook-form';

import { cn } from '@/lib/utils';
import { Label } from '@/components/ui/label';

const Form = FormProvider;

type FormFieldContextValue<TFieldValues extends FieldValues = FieldValues, TName extends FieldPath<TFieldValues> = FieldPath<TFieldValues>> = {
    name: TName;
};

const FormFieldContext = React.createContext<FormFieldContextValue>({} as FormFieldContextValue);

const FormField = <TFieldValues extends FieldValues = FieldValues, TName extends FieldPath<TFieldValues> = FieldPath<TFieldValues>>({
    ...props
}: ControllerProps<TFieldValues, TName>) => {
    return (
        <FormFieldContext.Provider value={{ name: props.name }}>
            {/* @ts-ignore */}
            <Controller {...props} />
        </FormFieldContext.Provider>
    );
};

const useFormField = () => {
    const fieldContext = React.useContext(FormFieldContext);
    const itemContext = React.useContext(FormItemContext);
    const { getFieldState, formState } = useFormContext();

    const fieldState = getFieldState(fieldContext.name, formState);

    if (!fieldContext) {
        throw new Error('useFormField should be used within <FormField>');
    }

    const { id } = itemContext;

    return {
        id,
        name: fieldContext.name,
        formItemId: `${id}-form-item`,
        formDescriptionId: `${id}-form-item-description`,
        formMessageId: `${id}-form-item-message`,
        ...fieldState,
    };
};

type FormItemContextValue = {
    id: string;
};

const FormItemContext = React.createContext<FormItemContextValue>({} as FormItemContextValue);

const FormItem = React.forwardRef<HTMLDivElement, React.HTMLAttributes<HTMLDivElement>>(({ className, ...props }, ref) => {
    const id = React.useId();

    return (
        <FormItemContext.Provider value={{ id }}>
            <div ref={ref} className={cn('space-y-2', className)} {...props} />
        </FormItemContext.Provider>
    );
});
FormItem.displayName = 'FormItem';

const FormLabel = React.forwardRef<React.ComponentRef<typeof LabelPrimitive.Root>, React.ComponentPropsWithoutRef<typeof LabelPrimitive.Root>>(
    ({ className, ...props }, ref) => {
        const { error, formItemId } = useFormField();

        return <Label ref={ref} className={cn(error && 'text-destructive', className)} htmlFor={formItemId} {...props} />;
    },
);
FormLabel.displayName = 'FormLabel';

const FormControl = React.forwardRef<React.ComponentRef<typeof Slot>, React.ComponentPropsWithoutRef<typeof Slot>>(({ ...props }, ref) => {
    const { error, formItemId, formDescriptionId, formMessageId } = useFormField();

    return (
        <Slot
            ref={ref}
            id={formItemId}
            aria-describedby={!error ? `${formDescriptionId}` : `${formDescriptionId} ${formMessageId}`}
            aria-invalid={!!error}
            {...props}
        />
    );
});
FormControl.displayName = 'FormControl';

const FormDescription = React.forwardRef<HTMLParagraphElement, React.HTMLAttributes<HTMLParagraphElement>>(({ className, ...props }, ref) => {
    const { formDescriptionId } = useFormField();

    return <p ref={ref} id={formDescriptionId} className={cn('text-sm text-muted-foreground', className)} {...props} />;
});
FormDescription.displayName = 'FormDescription';

const FormMessage = React.forwardRef<HTMLParagraphElement, React.HTMLAttributes<HTMLParagraphElement>>(({ className, children, ...props }, ref) => {
    const { error, formMessageId } = useFormField();
    const body = error ? String(error?.message) : children;

    if (!body) {
        return null;
    }

    return (
        <p ref={ref} id={formMessageId} className={cn('text-sm font-medium text-destructive', className)} {...props}>
            {body}
        </p>
    );
});
FormMessage.displayName = 'FormMessage';

export { useFormField, Form, FormItem, FormLabel, FormControl, FormDescription, FormMessage, FormField };
